Implemented SetArgVarType to the context for calling functions with variable argument types


git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@2058 404ce1b2-830e-0410-a2e2-b09542c77caf
Fixed some compiler warnings on gnuc in the add-ons


git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@2059 404ce1b2-830e-0410-a2e2-b09542c77caf